Did you have skies? I tried AC4 on my PC, worked fine, but the sky was gone. Seems like something important for a flight game.

Here's a little (<- understatement) project I worked on this afternoon, a list of every single plane we may face and how much money you'd be payed for shooting it down. It's currently under 'Bestiary' in the OP. Of course, there's probably a lot missing, so I'm counting on you guys to give fair advice! :)